/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionPrecomputedAOMask.h
A material expression that allows access to the precomputed AO mask generated when bGenerateAmbientOcclusionMaterialMask is enabled in Lightmass World settings.
class UMaterialExpressionPrecomputedAOMask : public [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression)